As of now, she is estimated to be worth over $900 million. In comparison, Kim Kardashian West is worth $350 million. Jenner is expected to take over for Mark Zuckerberg, who previously held the throne of youngest self-made billionaire through Facebook.

Jenner began selling Kylie Cosmetics in 2016. Since the company's launch, she has sold more than $630 million worth of makeup. In 2017 alone, the company made $330 million. Jenner also benefits from her family's reality show on E! Entertainment Television and her own deals with Puma shoes and PacSun clothing.

The entrepreneur credits social media for much of her success. She boasts over 100 million followers on Instagram.

"Social media is an amazing platform," Jenner said. "I have such easy access to my fans and my customers."